4y^3-4y^2+3-y

To simplify the expression 4y^3 - 4y^2 + 3 - y, we can combine like terms. Like terms are terms that have the same variable(s) raised to the same exponent(s). In this case, the like terms are the terms with "y" as the variable raised to the power of 3, 2, and 1, respectively.

Let's rearrange the terms in the expression:

4y^3 - 4y^2 - y + 3

Now, let's combine the like terms:

(4y^3) + (-4y^2) + (-y) + 3

The final simplified form of the expression is:

4y^3 - 4y^2 - y + 3